# Third-party notices and research acknowledgments

This file records incorporated third-party code and prior public research that materially informed this
project. It does not license Eushully game assets or code, and no original game files are distributed with
this repository.

## Eushully-Decompiler research

Early SYS4 instruction decoding and the initial opcode ABI/catalog were informed by Kelebek's public
[Eushully-Decompiler](https://github.com/Kelebek1/Eushully-Decompiler) project. That work established a
valuable starting point and accelerated this reimplementation. Historical and per-opcode provenance is
preserved in `vm-map/opcodes.toml`.

This repository does not vendor the upstream source files. Its opcode registry combines that foundational
catalog with independent script-corpus analysis, native `AGE.EXE` investigation, runtime probes, and
reimplementation testing. This acknowledgment is not a claim that the project was developed under a formal
clean-room process.

## GARbro AGF decoding algorithm

`engine/Age.Engine/Sys4/AgfDecoder.cs` ports the AGF decoding algorithm from GARbro's
`ArcFormats/Eushully/ImageAGF.cs`, Copyright (c) 2014-2020 morkt, under the MIT License:

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> following conditions:
>
> The above copyright notice and this permission notice shall be included in all copies or substantial
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